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W-doped and modified high-nickel ternary positive electrode material

A cathode material, high nickel technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as mixing, phase transition, battery capacity structure damage, etc., to achieve improved rate performance, simple synthesis method, and reduced charge transfer resistance. Effect

Inactive Publication Date: 2019-06-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The high capacity of the high-nickel ternary cathode material has also brought many problems to it. With the expansion of the microcracks of the circulating material, the final material structure is broken; the reaction between the electrolyte and the cathode material leads to irreversible loss of battery capacity and structure. destruction; under high-voltage discharge, cations are mixed, resulting in a series of problems such as irreversible phase transitions

Method used

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  • W-doped and modified high-nickel ternary positive electrode material
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  • W-doped and modified high-nickel ternary positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] LiOH·H 2 O was added to the mortar for dry grinding for 4min, and then the nickel-cobalt-manganese oxide precursor (Ni 0.8 co 0.1 mn 0.1 (OH) 2 ) and tungsten trioxide were mixed evenly, and after dry milling for 10 minutes, ethanol was added to submerge the mixture of nickel-cobalt-manganese oxide precursor and tungsten trioxide, and wet milling was carried out for 30 minutes so as to mix more uniformly to obtain a solid powder; wherein LiOH·H 2 O and Ni 0.8 co 0.1 mn 0.1 (OH) 2 The molar ratio of tungsten trioxide is 1.05:1, and the amount of tungsten trioxide added is Ni 0.8 co 0.1 mn 0.1 (OH) 2 0.5% of mass. The solid powder is calcined in an oxygen atmosphere, first pre-calcined at 455°C for 4 hours, then heated to 700°C for 18 hours, and the heating rate is 3°C / min in the pre-calcining stage and the calcining stage, and the tube furnace is cooled Next, a W-doped modified high-nickel ternary cathode material is obtained, which is denoted as W-0.5.

[0...

Embodiment 2

[0043] LiOH·H 2 O was added to dry grinding in a mortar, and then nickel-cobalt-manganese oxide precursor (Ni 0.8 co 0.1 mn 0.1 (OH) 2 ) and tungsten trioxide were mixed uniformly, and after dry milling for 20 minutes, ethanol was added to submerge the mixture of nickel-cobalt-manganese oxide precursor and tungsten trioxide, and wet milling was carried out for 30 minutes so as to mix more uniformly to obtain a solid powder; wherein LiOH·H 2 O and Ni 0.8 co 0.1 mn 0.1 (OH) 2 The molar ratio of tungsten trioxide is 1.05:1, and the amount of tungsten trioxide added is Ni 0.8 co 0.1 mn 0.1 (OH) 2 1% of mass. The solid powder is calcined in an oxygen atmosphere. First, it is pre-calcined at 500°C for 5 hours, and then heated to 780°C for 15 hours. Next, a W-doped modified high-nickel ternary cathode material is obtained, which is denoted as W-1.

[0044] The XRD test result of final product is as figure 1 As shown, the final product prepared in this example does not c...

Embodiment 3

[0049] LiOH·H 2 O was added to dry grinding in a mortar, and then nickel-cobalt-manganese oxide precursor (Ni 0.8 co 0.1 mn 0.1 (OH) 2 ) and tungsten trioxide were mixed uniformly, and after dry milling for 30 minutes, ethanol was added to submerge the mixture of nickel-cobalt-manganese oxide precursor and tungsten trioxide, and wet milling was carried out for 40 minutes so as to mix more uniformly to obtain a solid powder; wherein LiOH·H 2 O and Ni 0.8 co 0.1 mn 0.1 (OH) 2 The molar ratio of tungsten trioxide is 1.05:1, and the amount of tungsten trioxide added is Ni 0.8 co 0.1 mn 0.1 (OH) 2 2% of mass. The solid powder is calcined in an oxygen atmosphere. First, it is pre-calcined at 550°C for 6 hours, and then heated to 850°C for 18 hours. The heating rate of the pre-calcination stage and the calcination stage is 5°C / min. Next, a W-doped modified high-nickel ternary cathode material is obtained, which is denoted as W-2.

[0050] The XRD test result of final pro...

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Abstract

The invention relates to a W-doped and modified high-nickel ternary positive electrode material, and belongs to the field of a chemical energy storage battery. The material is obtained by grinding anduniformly mixing a mixture of a nickel-cobalt manganese hydroxide, a tungsten source and LiOH.H2O to obtain solid powder, calcining the solid powder under an oxygen atmosphere and then cooling. By Wdoping, the material structure can be stabilized, charger transfer impedance is reduced, so that the electrochemical performance of the material is improved, and the material capacity retention rate and the rate performance of the material are improved. The synthesis method is simple, the process and the technology are easy to implement, and large-scale commercial application can be achieved.

Description

[0001] The invention relates to a high-nickel ternary cathode material modified by W doping, which belongs to the field of chemical energy storage batteries. Background technique [0002] With the intensification of environmental pollution and the shortage of oil resources, people pay more and more attention to environmental issues, and we are eager to build a low-carbon and environmentally friendly society. Therefore, in recent years, the new energy industry dominated by electric vehicles has also developed rapidly, but to completely replace fuel vehicles with electric vehicles, we need to improve the mileage, fast charging, safety and life of electric vehicles, etc. In order to achieve its purpose of competing with fuel vehicles. At present, all electric vehicles use lithium-ion batteries. Among the many lithium-ion battery cathode materials, the layered high-nickel ternary cathode material Li[Ni x co y mn 1-x-y] (0.6<x<1,0<y<1,0<1-x-y<1) compared to tra...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCY02E60/10
Inventor 李聪苏岳锋杨永清陈来杨智茹卢赟包丽颖谭国强王敬黄擎陈实吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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